Social aspects History 15 Social conditions 12 Education 10 Political aspects 7 Political violence 7 Aims and objectives 5 更多 ... Economic aspects 5 Music 5 Peace-building 5 Violence 5 Education, Higher 4 History and criticism 4 Insurgency 4 War victims 4 City planning 3 Culture 3 Educational sociology 3 Ethnology 3 Human body 3 Journalism 3 Motion pictures 3 Research 3 Rural development 3 Study and teaching 3 Climatic changes 2 Collective memory 2 Communication 2 Cultural property 2 Economic conditions 2 少 ...